Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
dai truc » dai thuc, doan truc, dai trung
dan thuc » dan toc, am thuc
ban danh » ban doanh, ban hanh, ban dan
danh va » doanh va, hanh va, anh va
xang xa » lang xa, mang xa, ang xa
hieu va » lieu va, hieu qua
cua tre » cuu tre, cua triet, dua tren
sach ty » sach y, sach tu, sach thu
cua te » cua tu

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty xang xa hoi. hieu va ((dai truc) OR (dan thuc)) ban danh va ((cua tre) OR (cua te))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty xang xa hoi. hieu va ((dai truc) or (dan thuc)) ban danh va ((cua tre) OR (cua te))~".
• Adding a wildcard symbol may retrieve word variants: thu sach ty xang xa hoi. hieu va ((dai truc) or (dan thuc)) ban danh va ((cua tre) OR (cua te))*.